Generally, almost 65% of the total calorie intake should be acquired from carbohydrates according to the standard nutritional guidelines. Proteins represent a very small portion in the ideal balanced diet while fat represents almost one-third of the total caloric content. MORE Â».
The trench is then backfilled, and additional material added to the top. Both of the Baltimore tunnels (the Harbor Tunnel and Fort McHenry Tunnel) used this method in their construction. The Harbor Tunnel, built in the mid-1950s, was considered an engineering marvel.
History. 1  Baltimore was established in 1729 and named for the Irish barony of Baltimore (seat of the Calvert family, proprietors of the colony of Maryland). It was created as a port for shipping tobacco and grain, and soon local waterways were being harnessed for flour milling.